Kinetis K21: 120MHz Cortex-M4F MCU, 1MB Flash, 128KB SRAM, Full-Speed USB, Anti-tamper, 144-LQFP
Freescale
Freescale - MK21FN1M0VMC12
$11.01 - $11.56
Freescale - MK21FN1M0VMD12
Freescale - MK21FX512VLQ12
$17.86
Freescale - MK21FX512VMC12
$10.24
Freescale - MK21FX512VMD12
$9.55 - $13.85